A manufacturing process derived from paper technology can be used to produce a flat porous metallic material. To this end, organic fibers, fillers and additives are mixed with metal powder and the pulp is subsequently processed on a paper making machine. The so-called green paper is then subjected to a heat treatment where the organic components are removed. After that, the remaining sheets are sintered at temperatures close to the melting point of the metal powder, resulting in a purely metallic porous material, the so-called sinter paper. This approach has been used for the development of different porous transport layers made from titanium and nickel for application in electrolysis and stainless steel 316L paper for gas diffusion layers in PEM fuel cells. The thickness of the porous sheets ranges typically from 200 to several hundred microns with porosities anywhere between 40 and 60 %. The contribution gives examples of all material types including morphological characteristics and performance testing results. The morphological characterization was carried out based on high-resolution µCT scans which were analyzed via the software package GeoDict. Measured and calculated values of the electrical conductivity have been compared and measurement results of the electrochemical performance in single-cell test benches are presented.